解决全站乱码过滤器

来源：互联网发布：淘宝上二手房翻新编辑：程序博客网时间：2024/05/22 09:47

中文乱码真的很讨厌，如果每次请求都使用request设置一下编码真的麻烦，我们可以使用过滤器filter来显示全站的乱码问题

package web.filter;import java.io.BufferedReader;import java.io.IOException;import java.io.UnsupportedEncodingException;import java.security.Principal;import java.util.Enumeration;import java.util.Locale;import java.util.Map;import javax.servlet.Filter;import javax.servlet.FilterChain;import javax.servlet.FilterConfig;import javax.servlet.RequestDispatcher;import javax.servlet.ServletException;import javax.servlet.ServletInputStream;import javax.servlet.ServletRequest;import javax.servlet.ServletResponse;import javax.servlet.http.Cookie;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletRequestWrapper;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;//解决全站乱码过滤器public class CharacterEncodingFilter implements Filter {     public void destroy() {          // TODO Auto-generated method stub     }     public void doFilter(ServletRequest req, ServletResponse resp,               FilterChain chain) throws IOException, ServletException {                   HttpServletRequest request = (HttpServletRequest) req;          HttpServletResponse response = (HttpServletResponse) resp;                   request.setCharacterEncoding("UTF-8");          response.setCharacterEncoding("UTF-8");          response.setContentType("text/html;charset=UTF-8");                            MyCharacterEncodingRequest requestWrapper = new MyCharacterEncodingRequest(request);          chain.doFilter(requestWrapper, response);              }     public void init(FilterConfig filterConfig) throws ServletException {          // TODO Auto-generated method stub     }}/*1.实现与被增强对象相同的接口2、定义一个变量记住被增强对象3、定义一个构造器，接收被增强对象4、覆盖需要增强的方法5、对于不想增强的方法，直接调用被增强对象（目标对象）的方法*/class MyCharacterEncodingRequest extends HttpServletRequestWrapper{         private HttpServletRequest request;     public MyCharacterEncodingRequest(HttpServletRequest request) {          super(request);          this.request = request;     }     @Override     public String getParameter(String name) {                   try{               String value= this.request.getParameter(name);               if(value==null){                    return null;               }                             if(!this.request.getMethod().equalsIgnoreCase("get")) {                    return value;               }                             value = new String(value.getBytes("ISO8859-1"),this.request.getCharacterEncoding());               return value;                        }catch (Exception e) {               throw new RuntimeException(e);          }     }}

然后在web.xml中配置filter拦截所有请求

<filter>  <filter-name>CharacterEncodingFilter</filter-name>  <filter-class>web.filter.CharacterEncodingFilter</filter-class>  </filter>    <filter-mapping>  <filter-name>CharacterEncodingFilter</filter-name>  <url-pattern>/*</url-pattern>  </filter-mapping>

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